Wall board and joint



Dec. 12,1933. Q K, swn- WALL BOARD AND/ JOINT F iled May 27, 1952 Patented Dec. 12, 1933 1,939,528

UNITEDhSTATES PATENT OFFICE WALL OARD AND JOINT Clement K. Swift, Upper Darby, Pa., assignor to MacAndrews & Forbes Company, Camden,-

N. 1., a corporation of New Jersey Application May 27, 1932. Serial No. 613,990

' 2 Claims. (01. 72-31) This invention relates to a wall board having studding member to which is secured a plurality a Joint made therewith and more particularly to of wall board units; the construction of the wall board joint. Fig. 2 is a view in perspective similar to the dis- One object of the invention is to provide a wall clos in Fig- S owi coatihg of plaster a board as described, affording an improved wall other material applied to the outer surface of the 60 construction made of a plurality of wall board wall construction; units. Fig. 3 is a fragmentary end elevation showing Another object of the invention is to provide the wall board j int f r h u j ct of the a wall board and a joint made therewith which present invention; a d 10 will be more eflicient in use than similar conigs- 4 d 5 a Views Similar to 3 Sh structions heretofore available. .ing modifications of the invention.

Another object of the invention is to provide a As is well known to those familiar with the wall board having a joint made therewith which, p s t t. n wal s u tu ad r a p uwhen associated with a plurality of'similar wall rality of Wa l a d units ,Of e typ forming board units to form a wall, affords a continuous the subject of the present invention and finished 70 plane surface to receive a coat of plaster or other with a coat of plaster Other material, there s material. a prevalent tendency for the plaster to crack on Another object of the invention is to provide a the lin of jointu f w d nt n rlying wall board joint construction which may easily wal d unitss cracking of the Plaster be fitted together despite discrepancies in the forfinish has .been eliminated to some extent by 76 mation of the joint during manufacture. fabricating the wall boards so that while more Another object of the invention is to provide a, or less rigid of b dy, Sa d boards yield materially wall board joint comprising a male and a female as a. result of the absorption of the maximum member, each having longitudinal beveled sides, of expansion and contraction in the wall which the angle of bevel of the male member'being is not possible in a dense, compact wall board 80 greater than the angle of bevel of the female unit, w c as little O 110 v ,'a d therefore memberwhereby a tight joint is provided which localizes at the j is effectively sealed against the penetration of Furthermore, the major y of W b a d u i plaster, or other coating material, inwardly of having joints made therewith, are designed with the joint. the .primary purpose of providing a substantial 85 Another object of the invention is to provide a recess in the wall surface at the line O l u wall board joint comprising a male and female of the assembled wall board units, which is filled member, whereby the respective units associated by the plaster finish for the P11111059 0f reinforcin the construction of a wall are maintained in in h finish at e j n hi f ature of decoplanar alignment with respect to each other sign is very unsatisfactory, because when the 00 at all times. I plaster finish so applied, becomes dry, the portion A niore specific object of the invention is to of the plaster-filling the recess is disposed in a provide a wall board joint comprising a male and plane offset from the plane of the wallproper. female member, each having longitudinal beveled It is well known to those familiar with the art 40 sides terminating in an abutment positioned norof plastering, that to disposed plaster in any but 95 mally with respect to the plane faces of the board, a single continuous plane creates a tendency the angle or bevel 594d male member being for the plaster to crack at the juncture of the greater than the angle of bevel of the female planes bounding the plasten it is the f member effecting mm, abutting mured sirable to provide a wall board and joint which, against penetration of plaster or other coating when associated with a plurality of similar units material inwardly thereof.

4 1n the construction of a wall, affords a con- A further object of the invention is to provide tmuous' Smooth wall urface permitting every awall board ointhavin novel com ressible r-- tions adjacerit theilongi udinal edgegof the 1121c portion"): the plaster fimsh to be applied to F member, aflordingl a tight, close fitting, and underlying wall board units in coplanar relation. 5 smooth jointure 'of a plurality of board units; The present invention provides a wall board Other features and details of the invention are unit and joint which is novelly constructed n set forth hereinafter and disclosedin the accomeasy to assemble and wh n j ined with other panying drawing, in which: similar wall board units in the construction of Figure 1 is a view in perspective showing a a wall, affords a continuous planesurface to re- 2 ceive the finishing coat of flaster or other material Referringnow more particularly to the drawing, a preferred formof the wall board unit 1,

made in accordance with the present invention,

is rectangularly formed and secured to the customary wall studdings 2 with the long dimensions of the unit positioned normal to said studdings. The short ends of the wall board unit indicated by the numeral 3 are substantially fiat and at right angles with respect to the parallel faces 4 and 5 of the board, one of said surfaces 4 and 5 being arranged for contact with the studdings 2, and the other forming the exposed or outer wall surface when in place.

Oneof the long edges of the wall board unit is cut to form a longitudinal projection 6 constituting the male member of a joint, the sides 6a thereof being bev'eled at an angle with respect to the parallel planesurfaces 4 and 5 of the board, and terminating at the outer edge of the projection in a substantially fiatportion as shown in Fig. 3 of the drawing. The opposite edge of the wall board unit is provided with a complementary beveled groove 7 which is arranged to receive the corresponding longitudinal beveled projection 6 of a similar wall board unit.

For the purpose of providing the tight, wedgelikejointm'e of a plurality of board units associated in the construction of a wall, and to provide an effective seal against penetration of any coating inwardly of the joint, the beveled sides 6a. of the male member 6 are formed at a greater I members of the joint which precludes the possiangle with respect to the plane face of the board than are the beveled sides 7a of the complementary groove 7 as. shown in Fig. 3 of the drawing.

As shown in Figs. 1, 2 and 3 of the drawing; the male and female sections of the preferred joint are each provided with a seat or an abutment 8 at the inner edge of the beveled sides 6a of the member 6 and at the outer edges of the beveled sides la of the groove 7, the said abutments extending at right angles to the plane surfaces 4 and 5 of the board.

The abutments '8 are particularly advantageous and afford a firm seat for the complementary bility of wedging the male and female members together with sufficient force to cause the overlapping portions or sides of the female member to bulge outwardly and destroy the continuous plane surface provided for the reception-of a coating material.

By the present invention a wall board and joint is provided which, when associated with a plurality of similar units in'the construction of a wall, affords a tight, wedgelike joint therefor in a manner providing a continuous smooth wall surface for the application of a coating. The degree of difierence in the angular position of the bevels of the projection and the groove,

, permits of easy assembly of a group of the units,

1,9sa,sas

vided with longitudinal feathers 9, 9 at the inner edges of the beveled sides 60 adjacent each of the parallel faces 4 and 5 of the board.

In the present instance the feathers 9 may be formed simultaneous with the cutting of the beveled side faces 6a of the projection, the said surfaces 60 being cut by means of a saw, or any other cutting means, from the apex of the projection 6 angularly in the direction of the plane surfaces 4 and 5 of the board, and it should be particularly noted that the bevel surfaces 6", terminate prior to intersecting the plane faces 4 and 5 of the board, thus forming the small feathers 9, 9 which project beyond the inner edges of the beveled faces 6a in a reverse bevel having a width substantially equal to that of the saw or other tool used in cutting the bevels 611.

By reason of the relatively small size of the feathers 9, 9. they are inherently compressible to an extent suflicient to effect a tight seal to the joint which provides a wall having a continuous plane surface for the reception of a plaster fin; ish or not, as the case may be. Furthermore, the compressibility of the feathers 9, 9 provides an expansion and contraction factor which, under certain conditions maybe desirable in fibre wall boards which are of a yieldable and moisture absorbing nature.

Fig. 5 of the drawing discloses a further modification of the wall board joint which is substantially similar in design to that previously described, though not provided with the complementary abutting surfaces 8 as in Fig. 3 or the feather elements 9 adjacent the'parallel plane surfaces of the unit as disclosed in Fig. 4 of the drawing.

From the foregoing it will be seen that the improved joint I have invented is characterized by a beveled or tapered projection and groove, both the projection and groove being substantially V-shaped with the angle included between the beveled faces of the projection being somewhat greater than the angle defined by the beveled faces of the groove, but it is to be understood that while I have set forth the particular embodiment of the present invention for purposes of description, it is not intended that the structure shall'be limited thereto other than within the scope of the appended claims.

What is claimed is:

1. A wall board plaster base unit of yielding fibrous and moisture absorbable character adapted to receive a plaster-like coating on a surface thereof, including a longitudinal projection on one edge' offset from the plane surfaces of said board, said projection having oppositely beveled sides disposed at equal angles with the plane of the faces'of the board and terminating at its outer end in a substantially flat portion and at the inner ends thereof in abutments disposed at right angles to said plane faces and constituting the offsets, and the opposite edge of the unit having a beveled groove, the sides of which are disposed at a lesser angle than the beveled sides of the projection and terminate at their outer edges iris portions of said faces out of contact with each V and moisture ansorbable character adapted to receive a plaster-like coating on a surface thereof, comprising a plurality of boards set edge to edge and having interlocking substantially V- shaped tongues and grooves, and abutting surface areas adjacent each side of said interlocking members and disposed at right angles to the plane of the faces of said boards, said beveled facesofthe tongueofeachboardbeingcuton 1 an angle greater than that between the beveled 'ioo a no 

